Compress PDF Online — Free & 100% Private
Shrink large PDF files in seconds, right inside your browser. Your document is never uploaded to a server — all compression happens on your device. No accounts, no watermarks, no limits.
🗜️ Compress a PDF now →How to compress a PDF for free
- Open the Moriaki PDF compressor — no download or install needed.
- Drag and drop your PDF (or click to select it). It loads instantly in your browser.
- Choose a compression level — High, Medium, or Low — depending on how small you need it.
- Click Compress and download your smaller PDF. Your file never leaves your computer.
Why compress PDFs with Moriaki?
Most “online” PDF compressors upload your file to their servers, process it there, and ask you to trust that they delete it afterward. For contracts, IDs, or financial statements, that’s a real privacy risk.
Moriaki PDF is different: every operation runs locally in your browser. You can even disconnect from the internet after the page loads and the compressor still works — proof that your document never touches a remote server.
Frequently asked questions
Is it really free to compress PDFs?
Yes. Moriaki PDF is completely free with no accounts, no daily limits, and no watermarks added to your files.
Are my files uploaded anywhere?
No. Compression happens entirely in your browser on your own device. Your PDF is never sent to or stored on any server.
How much smaller will my PDF get?
It depends on the file. Image-heavy PDFs can shrink dramatically (often 50–90%) on the High setting. Choose Low or Medium to keep more detail.
Will compressing reduce quality?
Higher compression re-encodes page images at a lower quality to save space. For the best balance, start with Medium and increase only if you need a smaller file.
Does it work on mobile?
Yes — it runs in any modern browser on desktop, tablet, or phone, with no app to install.